Period pain

Got my period for the first time in 93 days .... I was wondering something ..... I've heard for other women when it happens your supposed to feel pain in your low abdomen but me I don't feel pain at all I know I'm getting my period because I get this weird feeling in my thighs like blood is drawing from there and my legs feel sore kinda like your arm dose after you give blood well I feel like my uterus is not like idk working right something it up?? Anyone else have answers or feel this way??